James d



I (N0 Model.)

J. D. LEE.

SMOKE GONSUMING FURNACE. No. 464,506. Patented DQO. 8, 1891.

UNITED STATES JAMES D. LEE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE LEESMOKE BURNER AND FUEL SAVING FURNACE COMPANY, OF SAME PLACE.

SMOKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 464,506, dated December8, 1891. Application filed September 8, 1890. Serial No. 364,257. (Nomodel.)

To all whom it may concern/.- Be it known that I, JAMES D. LEE, ofOhicago, in the county of Cook and State of Illinois, have invented acertain new and useful Improvement in a Smoke -Consuming Furnace, ofwhich the following is afull and complete description, when taken inconnection with the drawings accompanying and forming a part hereof.

IO This invention is an improvement of the invention set out, described,and claimed in Patent No. 383,310, granted to me for a smokeconsumingfurnace on the 22d day of May, 1888; and the object of this invention isto :5 obtain a device which can be attached to an ordinaryboiler-furnace in combination with the device or an essential partthereof contained in the above-named patent, and wherein the completedfurnace thereby attained will perform the same work under conditionswhere the draft is defective or poor as is performed under theordinaryconditions of using a smoke-consuming furnace by the device described in my said patent.

25 In order to accomplish the results sought by me, as aforesaid,in thedevice obtained by the combination of the invention herein describedwith the invention described in the above-referred-to patent and thedevices in 0 common use in boiler-furnaces, I find it necessary toprovide an arrangement for taking the contents of the smoke-stack orsmokepassage of the furnace and return such material or materials to thefurnace above the grate-bars of the combustion-chamber; to

provide means for introducing air through the bridge-wall of the furnaceto theproducts of combustion or partial combustion passing thereoverfrom the combustion-chamber, such air so passing through the bridge-wallto be forced through the passage or way provided therefor by a fan, orto be drawn through by the natural draft, as I choose to term it, of thefurnace, although such natural draft may be produced when the dampers inthe smokestack and the front door of the fire-pot are closed by the fandrawing the contents of the smoke-passage therefrom and returning themto the combustion-chamber over the gratebars thereof, as preferred, and,further, to introduce a current of air under pressure to the ash-pit'ofthe furnace, thereby creating, when the doors of the ash-pit are closed,a greater pressure of air in the ash-pit than in the combustion-chamberor in the room surrounding the furnace.

In the drawings, Figure 1 is a front elevation of the boiler-furnacehaving my inventions attached thereto; Fig. 2, a side elevation thereof,and Fig. 3 a cross-section on line 3 3 of Fig. 2.

Like letters refer to the same part throughout the several viewsthereof. 7

A is the boiler front; A, the inclosing walls of the boiler; A theboiler; A the line of .the bridge-wall; A the ash-pit; a a, the ash-pitdoors; B, the combustion-chamber; B, the grate-bars, and B a fan. Thefan B is connected to and with the smokestack 0 by pipe 0. 7o

' C is a discharge-pipe extending from the fan to both sides of theboiler-furnace, and O O are branch pipes which extend along the sidewalls of the boiler-furnace.

G C are pipes extending from branch pipes 7 C O to and into thecombustion-chamber B.

It will be observed that I have'illustrated the pipe 0 as extendingacross and in front of the boiler-front A, and the branch pipes C O asextending along the side walls of the furnace, outside thereof; but itis evident that the pipe 0 may extend across the ash-pit above or belowthe doors and inside thereof, or may be placed underneath the ash-pit,and the pipes O 0 may, in like manner, be embedded or built into theside walls A A, if desired.

WVhen the fan 13 is in operation, the heated products from thecombustion-chamber passing into the smoke stack or smoke passage 0, andwithdrawn therefrom by the fan, are forced into the combustion-chamberabove the grate-bars thereof in precisely the same manner as in thePatent No. 383,310, hereinbefore referred to, and constitutes theessential part of the invention secured by such patent. The severalinventions made by me and combined with these essential elements of myformer invention, and whereby I obtain the invention claimed herein arecomposed of the following elements: pipe D, embedded in the bridge-wallD, and pipes D D extending from pipe D to the inner face of thebridge-wall and valves 1) in pipe D 5 and, further, space E in thebridge-wall D, openings E E, extending from space E to the face of thebridgewall in the ash-pit A, and pipe E extending from space E to fan Fand forming the discharge-pipe of such fan.

F is a pipe which may extend from the fan F to any part of the chamberwherein the furnace is located or to the outer air, as preferred. Unlessit is desired to extend the pipe F to the outer air or to the top partof the furnace chamber or room, I do not consider the pipe F necessary,and in no case do I consider it an essential part of my invention.

hen the ash-pit doors a a are closed and the fan F is in operation, airis forced through the pipe E space E, and openings E" E into the ash-pitA" and a greater pressure of air thereby produced in such ash-pit thanobtains in the combustion-chamber B, and an artificial blast of air isthereby forced through the grate-bars into the combustion-chamber.\Vhile air is contained under pressure, as stated, in the ash-pit it isheated to a considerably higher temperature than the air surrounding thefurnace, and as it is forced into the combustion-chamber such portion ofsaid air as is not required to enter into the combustion of the contentsof the combustionchamber below the line of the openings of pipes C O iswell adapted to combine with and assist in the combustion of thecontents of the pipes 0 0 as such contents are delivered into thecombustion-chamber.

IV hen I desire to force or apply pressure to the air passing throughpipes D and D and from thence entering the furnace, I connect the pipe Dwith one of the branch pipes 0 but I have found such results can beattained by simply leaving the ends of the pipe D open, thereby securingwhat I term a natural draft through these pipes D D but I prefer,ordinarily, not to connectthis pipe D to pipe 0 It will be seen that inthe device obtained by the combination of the severalhereinbefore-described elements the contents of the smoke-stack orsmoke-passage withdrawn therefrom by the fan are returned and forcedinto the combustion-chamber of the furnace in the same manner as in thedevice which forms the subject-matter of the patent hereinbeforcreferred to; but in the present device I do not return or force any ofsuch contents into the ash-pit, as is done in one of the forms ofconstruction described in such patent, or through pipes embedded in thebridgewall of the furnace, as in another of the forms of constructiontherein described; but in place thereof I force air obtained either fromwithin or without the building wherein the furnace is placed into theaslrpit and from there through the grate-bars into thecon1bustionchamber, and I also in the present device supply air, eitherunder pressure or not under pressure, as preferred, obtained from withinor from Without such building through openings in the bridgeqvall tointcrmingle with the smoke, gases, or other products of partialcombustion passingoversuch bridge-wallfrom the combustion-chamber andinto the smoke stack or smoke-passage.

The amount of air forced into the ash-pit is regulated by the size andspeed of the fan and by the dampers ff, and the amount of smoke, gases,or other products of partial combustion supplied to'thecombustion-chamber from the smoke-stack or smoke-passage is alsodetermined in the same way.

Having thus described my invention and its method of operation, What Iclaim, and (lesire to secure by Letters Patent of the United States, is-

In a smoke-consuming furnace, the combination of a fan, a pipe extendingfrom the smoke-passage. of the furnace to the fan, a pipe extending fromthe fan to the combustion-chamber of the furnace, a pipe open at the endembedded in the bridge-wall of the furnace and having branch pipesextending therefrom to the inner face of the bridge-wall, a second fanand a pipe extending therefrom into the ash-pit, whereby the contents ofthe smoke-passage withdrawn therefrom by the first-named fan arereturned to the combustion-chamber of the furnace, air is supplied tothe heated matter, leaving the combustionchamber and passing over thebridge-wall to the smoke-passage, and air is forced into the ash-pit andfrom there to the combustionchambcr between the grate-bars thereof,substantially as described.

Janus 1). LEE.

\Vitn esses:

JULIUs L. GOLDBERG, I. I I. GOLDBERG.

ICO

